Engine Tune-Up Chapter 47. Engine Tune-Up A modern tune-up is performed as a part of routine maintenance instead of a drive-ability problem. People used

Engine Tune-UpEngine Tune-Up

Chapter 47Chapter 47

Engine Tune-Up

A modern tune-up is performed as a part of routine maintenance instead of a drive-ability problem.

People used to wait until the vehicle ran poorly to do a tune up

When modern vehicles run poorly, it’s usually a sensor or computer related problem and seldom will a tune-up repair the it!

Engine Tune-Up - Spark Spark PlugsPlugs Some vehicle do not schedule a spark Some vehicle do not schedule a spark

plug replacement until 100,000 miles!plug replacement until 100,000 miles!

Engine Tune-Up

Service and replacement items in a minor tune up include:

1 2 3 4 5 6

Engine Tune-Up - Minor Minor TuneTune

Engine Tune-Up - Major Major TuneTune Service and replacement items in a

major tune up include: 1 2 3 4 5 6

Engine Tune-Up - Diagnostic Diagnostic toolstools

Diagnostic tools used during a major tune up include:

1 2 3 4 5 6

Engine Tune-Up - Performance Performance factorsfactors

Performance factors affected by a tune up include:

1 2 3 4 5 6

Engine Tune-Up - Rough Rough IdleIdle

Technician at the right says a tune-up will not correct a rough idle in most cases.

When modern vehicles run poorly, it’s usually a sensor or computer related problem and seldom will a tune-up repair the it!

Technician at the left says the rough idle is most likely due to a defective or malfunctioning sensor, actuator, or ECM.

Both Techs are ASE Certified Master Both Techs are ASE Certified Master TechniciansTechnicians

Engine Tune-Up - InformationInformation

It important to gather engine and vehicle performance information before performing the tune-up

Engine Tune-Up - TemperatureTemperature

It important to bring the engine up to full operating temperature prior to diagnosing an operating condition

Engine Tune-Up - Service Service RecordsRecords

It is important to maintain a vehicle’s service records

Engine Tune-Up - Safety Safety RulesRules

OBD II automobiles require the battery be disconnected when performing vehicle service and maintenance.

Four (4) safety rules to follow when performing a tune-up:

1 2 3 4

Engine Tune-Up - Safety Safety RulesRules

Engine Tune-Up - ProceduresProcedures Vehicle inspections performed

during any tune-up:

Engine Tune-Up - ProceduresProcedures Steps in replacing spark plug

wires: 1 2 3

Engine Tune-Up - ProceduresProcedures When replacing spark plugs in an

aluminum engine the engine should be warm

Engine Tune-Up - ProceduresProcedures Tools used to remove and replace

spark plugs:

Engine Tune-Up - ProceduresProcedures Color observed on a spark plug

removed from an efficiently operating engine

Engine Tune-Up - ProceduresProcedures Steps that must be performed

before installing a spark plug in an engine

Spark plugs must be installed first , ______ ______ before ???????????

Engine Tune-Up - ProceduresProcedures

When installing spark plugs equipped with metal sealing washers the spark plug should be threaded in until it bottoms, then tightened an additional _____ turn.


Spark plug wires that are not put on the correct cylinder’s spark plug cause the engine to misfire, run poorly, or not run at all (backfires when trying to start).


The suggested replacement interval for one- and two-wire O2 sensors, For three wire sensors


The recommended procedure for replacing an O2 sensor


A compression test is performed during an engine’s life to check the engine’s mechanical condition without disassembly.


Three (3) primary adjustments performed during a tune-up:


Diesel engines require periodic maintenance similar to gasoline engines, but don’t have spark plugs to replace or an oxygen sensor to fail.

Engine Tune-Up - Diesel Diesel Tune-UpTune-Up

The typical service tasks performed during diesel engine maintenance intervals include:


Describe/Define a maintenance interval:


Engine Tune-Up

Questions?Questions? Refer to the Tune-up chapter (47) Refer to the Tune-up chapter (47)

in your textbook.in your textbook. Make sure your name, date, and Make sure your name, date, and

period are on your assignment period are on your assignment before you turn it in .before you turn it in .

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Engine Tune-Up Chapter 47. Engine Tune-Up A modern tune-up is performed as a part of routine maintenance instead of a drive-ability problem. People used